body{
    border:solid 1px #ccc;
    background: #fefefe;
    width: 100%;
    height: calc(100% - 15px);
    overflow: hidden;
    box-sizing: border-box;
    position: absolute;
}
.clear{height: 0px; overflow: hidden; clear: both;}

@mixin border-radius($radius) {
    border-radius: $radius;
-ms-border-radius: $radius;
-moz-border-radius: $radius;
-webkit-border-radius: $radius;
}